President Donald Trump tweeted support for the UK after a van plowed down people on the London Bridge on Saturday night. London Metropolitan Police also responded to a second incident in nearby Borough Market that appeared to be a stabbing.

London Metropolitan Police declared both incidents as terrorist incidents.

Earlier this week, the Trump administration asked the Supreme Court to immediately reinstate its ban on travelers from six mostly Muslim countries and refugees from anywhere in the world. The administration argues that the U.S. will be safer if the policy is put in place.

Lower courts have blocked the Trump policy, citing various reasons including statements Trump made during the 2016 campaign. The legal fight pits the president's authority over immigration against what lower courts have said is a policy that purported to be about national security but was intended to target Muslims.

Trump later called Prime Minister Theresa May to offer condolences. The White House said the president "praised the heroic response of police and other first responders and offered the full support of the United States government in investigating and bringing those responsible for these heinous acts to justice."

The State Department issued a statement condemning them as "cowardly."

"The United States stands ready to provide any assistance authorities in the United Kingdom may request," State Department spokeswoman Heather Nauert said.

"Our hearts are with the families and loved ones of the victims. We wish a full and quick recovery to those injured in the attacks. All Americans stand in solidarity with the people of the United Kingdom," she said.